• Sublime Core Feed
Low Severity

Spam: Campaign with excessive space/char obfuscation and free file hosted link

Description

This rule detects mass spam campaigns using excessive space padding with links utilizing free file hosting.

Sublime Security
Created Aug 17th, 2023 • Last updated Jul 16th, 2025
Source
type.inbound
and length(attachments) == 0
and regex.icontains(coalesce(body.html.inner_text, body.html.display_text),
                    '([a-zA-Z\d\.]\s){30,}'
)
and any(body.links,
        .href_url.domain.domain in $free_file_hosts
        or .href_url.domain.root_domain in $free_file_hosts
)
and (
  profile.by_sender().prevalence in ("new", "outlier")
  or profile.by_sender().any_messages_malicious_or_spam
  or sender.email.domain.valid == false
)

and not profile.by_sender().any_messages_benign
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